Date: Thu, 11 Feb 2021 18:07:21 -0700 From: "Russell L. Carter" <rcarter@pinyon.org> To: Freddie Cash <fjwcash@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: upgrade stable/12 -> stable/13 zfs + boot partition Mediasize 64K Message-ID: <6e3976f2-9641-cfea-3c2f-4ae2d834f1f3@pinyon.org> In-Reply-To: <CAOjFWZ7VQOuNdwJ76vWCqpBSb5Cq18RYUQQXard6cAaQYnk=gg@mail.gmail.com> References: <ccc9862a-f6f6-f0c1-abd7-fd3bdd5a481f@pinyon.org> <CAOjFWZ57V_9Q1PUCnW8LM%2BLeQzRFgpFv8k_EynE19oWDa5d-YQ@mail.gmail.com> <CAOjFWZ7VQOuNdwJ76vWCqpBSb5Cq18RYUQQXard6cAaQYnk=gg@mail.gmail.com>
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On 2/11/21 5:43 PM, Freddie Cash wrote: > Sorry, meant 256 KB or 512 KB, not MB! > > On Thu, Feb 11, 2021 at 4:43 PM Freddie Cash <fjwcash@gmail.com> wrote: > >> On Thu, Feb 11, 2021 at 4:35 PM Russell L. Carter <rcarter@pinyon.org> >> wrote: >> >>> Greetings, >>> >>> I really want to jump from stable/12 to stable/13 but one thing is >>> causing a hesitancy. And that is, my main raidz2 system has >>> a system boot zfs mirror pair that has boot partition size >>> (Mediasize) of 64K, and when I tried to zpool upgrade that pool a >>> year or 2 ago I got some scary message something like "boot >>> partition size is not large enough". I asked about this on the >>> lists but never received an answer. So, laziness required me >>> to ignore the problem and not zpool upgrade any of my 15 or so >>> zpools in the interim. >>> >>> A few weeks ago I tried to make buildworld/installworld upgrade >>> 12->13 but the boot failed in the mounting filesystems phase with it >>> couldn't find a bootable target. So after restoring 12 I decided >>> to wait a bit. In the interim I have upgraded every zpool but that >>> one system pool. All the other freebsd-boot partitions have a size >>> of 512K. >>> >>> So what is the current advice? Is a freebsd-boot partition size >>> of 64K laughably obsolete, and I should get with the program and >>> repartition those disks, or can I march blindly into the upgrade? >>> >>> I guess I just want to understand where these sizes are going in >>> the future. >>> >>> That is laughably small and you need to enter the 21st century. ;) >> >> I believe the recommendation is 256 MB or even 512 MB these days. >> >> If you partitioned your disks using "-a 1M" with gpart(8) for the >> freebsd-zfs partition, then you'll have some slack space between it and the >> freebsd-boot partition. Just delete the freebsd-boot partition and create a >> larger one in it's place. I did something similar with some drives that >> were part of a separate storage pool that I wanted to make bootable, by >> creating a freebsd-boot partition in the slack space before the freebsd-zfs >> partition. >> >> If you don't have that slack space at the front, you will need to detach >> one of the drives from the mirror, re-partition it, then attach it back to >> the mirror. Rinse and repeat for the other side. ZFS shouldn't notice the >> pool is smaller by 1 MB (there's some internal slack space to allow you to >> add drives that are labelled as the same size, but actually have different >> numbers of sectors). >> >> Cheers, >> Freddie >> > > That's what I wanted to know, thanks a lot. I need to practice replacing drives on that mirror anyway. Although I will study carefully the partition boundaries to see if your shortcut might work. I'm a FreeBSD person until I die so I should to get these lower level details nailed. Best! Russell
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